Friday @ Lollapalooza: Good morning, grandma!

Lollapalooza 2011 opened with this ringing, backhanded endorsement from Jenn Wasner of the band Wye Oak: "I love Lollapalooza because it's the one festival even my grandparents know what it is."

Such cross-generational branding succeeded in selling out a record capacity this year. Over the weekend, 90,000 fans will attend each day of Lollapalooza. That makes this three-day concert event in Chicago's Grant Park one of the country's biggest, with Coachella's daily attendance around 75,000 and Bonnaroo's more than 100,000.

Get a good look at those baseball fields. When all 90,000 people arrive, they'll be gone. (Thomas Conner/Sun-Times)>

Thousands were already on hand Friday morning for the festival's opening sets, which included Baltimore duo Wye Oak and their Southern gothic shoegaze. Washer, however, struggled to get going against a bad guitar pedal that eventually forced her to stop mid-song and apologize.

"There seems to be a ghost in it or something," she said as drummer Andy Stack looked on helplessly. "This is the worst thing that's ever happened to me."

She eventually salvaged her gear and the set, completing the song "Plains" to gracious applause from several hundred devoted early fans.